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                <h1 class="title-article">Linux设置默认Python版本</h1>
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                    <span class="time">最后发布于2018-08-14 15:20:27                    </span>
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                                <div class="up-time">发布于2018-08-14 15:20:27</div>
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                                            <h2 id="1查看当前默认的python版本">1.查看当前默认的Python版本</h2>

<p>打开终端，输入python <br>
<img src="https://img-blog.csdn.net/20180814150528361?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JvbWFuY2U1MjAxMzE0/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述" title=""> <br>
可以看到当前系统中默认的python版本是 2.7.12</p>

<h2 id="2-修改默认python版本">2. 修改默认Python版本</h2>

<p>下面把默认的python版本从2.7改为3.5 <br>
进入”/usr/bin”目录下，输入”ls -l | grep python”显示所有名字中包含python的文件 <br>
<img src="https://img-blog.csdn.net/20180814150803219?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JvbWFuY2U1MjAxMzE0/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述" title=""> <br>
可以看到是python指向的是python2，而Python2指向的是Python2.7</p>

<pre class="prettyprint"><code class=" hljs haskell"><span class="hljs-title">lrwxrwxrwx</span> <span class="hljs-number">1</span> root root          <span class="hljs-number">16</span> <span class="hljs-number">8</span>月  <span class="hljs-number">14</span> <span class="hljs-number">14</span>:<span class="hljs-number">26</span> python -&gt; /usr/bin/python2
<span class="hljs-title">lrwxrwxrwx</span> <span class="hljs-number">1</span> root root           <span class="hljs-number">9</span> <span class="hljs-number">10</span>月  <span class="hljs-number">3</span>  <span class="hljs-number">2017</span> python2 -&gt; python2<span class="hljs-number">.7</span></code></pre>

<p>只要把python的指向改为python3即可，Python3指向的是Python3.5</p>



<pre class="prettyprint"><code class=" hljs bash">$ <span class="hljs-built_in">sudo</span> rm -rf python
$ <span class="hljs-built_in">sudo</span> ln <span class="hljs-operator">-s</span> /usr/bin/python3  /usr/bin/python</code></pre>

<p>再执行Python命令，可以看到 <br>
默认版本已经改成Python3.5.2了 <br>
<img src="https://img-blog.csdn.net/2018081415182761?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JvbWFuY2U1MjAxMzE0/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述" title=""></p>                                    </div>
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